The invisible drug

7 December 2014 10:59:43 AM AEDT

The drug in question is fluoride—which is added to a majority of municipal water supplies across the US. It's also found in a number of other products, most notably toothpaste and other dental treatments.

Sodium fluoride—which is a far simpler toxin than the fluoride compounds used for most water fluoridation—has been used for rat and cockroach poisons, so there is no question that fluoride is toxic.